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authorPeter Hurley <peter@hurleysoftware.com>2016-01-11 09:40:54 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-28 02:01:44 +0300
commitfdfb719e93b55a50f90da2059dc450e7c0c48e8f (patch)
tree5317736293b5c7c16673df42d4542b78a70831aa /Documentation/serial
parent582e20a03b9bcbddaeaffb38800323ddcc4a9173 (diff)
downloadlinux-fdfb719e93b55a50f90da2059dc450e7c0c48e8f.tar.xz
tty: Remove chars_in_buffer() line discipline method
The chars_in_buffer() line discipline method serves no functional purpose, other than as a (dubious) debugging aid for mostly bit-rotting drivers. Despite being documented as an optional method, every caller is unconditionally executed (although conditionally compiled). Furthermore, direct tty->ldisc access without an ldisc ref is unsafe. Lastly, N_TTY's chars_in_buffer() has warned of removal since 3.12. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/serial')
-rw-r--r--Documentation/serial/tty.txt3
1 files changed, 0 insertions, 3 deletions
diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt
index bc3842dc323a..798cba82c762 100644
--- a/Documentation/serial/tty.txt
+++ b/Documentation/serial/tty.txt
@@ -72,9 +72,6 @@ flush_buffer() - (optional) May be called at any point between
open and close, and instructs the line discipline
to empty its input buffer.
-chars_in_buffer() - (optional) Report the number of bytes in the input
- buffer.
-
set_termios() - (optional) Called on termios structure changes.
The caller passes the old termios data and the
current data is in the tty. Called under the